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Add support for NodeNetworkPolicy data plane
Signed-off-by: Hongliang Liu <[email protected]>
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| Original file line number | Diff line number | Diff line change |
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| # Antrea Node NetworkPolicy | ||
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| ## Table of Contents | ||
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| <!-- toc --> | ||
| - [Introduction](#introduction) | ||
| - [Prerequisites](#prerequisites) | ||
| - [Usage](#usage) | ||
| - [Limitations](#limitations) | ||
| <!-- /toc --> | ||
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| ## Introduction | ||
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| Node NetworkPolicy is designed to secure the Kubernetes Nodes traffic. It is supported by Antrea starting with Antrea | ||
| v1.15. This guide demonstrates how to configure Node NetworkPolicies. | ||
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| ## Prerequisites | ||
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| Node NetworkPolicy was introduced in v1.15 as an alpha feature and is disabled by default. A feature gate, | ||
| `NodeNetworkPolicy`, must be enabled in antrea-agent.conf in the `antrea-config` ConfigMap. | ||
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| ```yaml | ||
| apiVersion: v1 | ||
| kind: ConfigMap | ||
| metadata: | ||
| name: antrea-config | ||
| namespace: kube-system | ||
| data: | ||
| antrea-agent.conf: | | ||
| featureGates: | ||
| NodeNetworkPolicy: true | ||
| ``` | ||
| Alternatively, you can use the following helm installation command to enable the feature gate: | ||
| ```bash | ||
| helm install antrea antrea/antrea --namespace kube-system --set featureGates.NodeNetworkPolicy=true | ||
| ``` | ||
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| ## Usage | ||
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| Node NetworkPolicy is an extension of Antrea ClusterNetworkPolicy (ACNP). By specifying a `nodeSelector` in the | ||
| policy-level `appliedTo`, an ACNP is applied to the selected Kubernetes Nodes. | ||
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| An example Node NetworkPolicy that blocks ingress traffic from Pods with label `app=client` to Nodes with label | ||
| `kubernetes.io/hostname: k8s-node-control-plane`: | ||
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| ```yaml | ||
| apiVersion: crd.antrea.io/v1beta1 | ||
| kind: ClusterNetworkPolicy | ||
| metadata: | ||
| name: ingress-drop-pod-to-node | ||
| spec: | ||
| priority: 5 | ||
| tier: application | ||
| appliedTo: | ||
| - nodeSelector: | ||
| matchLabels: | ||
| kubernetes.io/hostname: k8s-node-control-plane | ||
| ingress: | ||
| - name: drop-80 | ||
| action: Drop | ||
| from: | ||
| - podSelector: | ||
| matchLabels: | ||
| app: client | ||
| ports: | ||
| - protocol: TCP | ||
| port: 80 | ||
| ``` | ||
| An example Node NetworkPolicy that blocks egress traffic from Nodes with the label | ||
| `kubernetes.io/hostname: k8s-node-control-plane` to Nodes with the label `kubernetes.io/hostname: k8s-node-worker-1` | ||
| and some IP blocks: | ||
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| ```yaml | ||
| apiVersion: crd.antrea.io/v1beta1 | ||
| kind: ClusterNetworkPolicy | ||
| metadata: | ||
| name: egress-drop-node-to-node | ||
| spec: | ||
| priority: 5 | ||
| tier: application | ||
| appliedTo: | ||
| - nodeSelector: | ||
| matchLabels: | ||
| kubernetes.io/hostname: k8s-node-control-plane | ||
| egress: | ||
| - name: drop-22 | ||
| action: Drop | ||
| to: | ||
| - nodeSelector: | ||
| matchLabels: | ||
| kubernetes.io/hostname: k8s-node-worker-1 | ||
| - ipBlock: | ||
| cidr: 192.168.77.0/24 | ||
| - ipBlock: | ||
| cidr: 10.10.0.0/24 | ||
| ports: | ||
| - protocol: TCP | ||
| port: 22 | ||
| ``` | ||
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| ## Limitations | ||
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| - This feature is currently only supported for Linux Nodes. | ||
| - Be cautious when you configure policies to Nodes, in particular, when configuring a default-deny policy applied to | ||
| Nodes. You should ensure Kubernetes and Antrea control-plane communication is exempt from the deny rules, otherwise | ||
| the cluster may go out-of-service and you may lose connectivity to the Nodes. | ||
| - Only ACNPs can be applied to Nodes. ANPs cannot be applied to Nodes. | ||
| - `nodeSelector` can only be specified in the policy-level `appliedTo` field, not in the rule-level `appliedTo`, and not | ||
| in a `Group` or `ClusterGroup`. | ||
| - ACNPs applied to Nodes cannot be applied to Pods at the same time. | ||
| - FQDN is not supported for ACNPs applied to Nodes. | ||
| - Layer 7 NetworkPolicy is not supported yet. | ||
| - For UDP or SCTP, when the `Reject` action is specified in an egress rule, it behaves identical to the `Drop` action. |
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